Man Made Rock (Sedimentary Analogue)

Sea Glass

Man-made silicate glass weathering product

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Asphalt Concrete (Bituminous Pavement)

Aggregates in Bitumen Matrix

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Diamond (or Simulant)

Carbon (C)

Opalite

Synthetic Opalised Glass

Slag

Metallurgical by-product

Dyed Agate

Chalcedony (SiO2)

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Crackle Agate / Dyed Quartz

SiO2 (Silicon Dioxide)

Rounded metallic-looking pebble, likely iron-rich rock or slag

Uncertain; possible limonite/goethite-rich ironstone, hematite-bearing material, or industrial slag

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Sea Glass

Silicon dioxide (mostly)

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Opalite

Man-made Glass (Synthetic Opalized Glass)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Weathered stone, likely sandstone or altered volcanic rock

Indeterminate; possibly quartz-rich sandstone or weathered tuff

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Opalite

Synthetic Opalite Glass

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Brick fragment (Man-made material)

N/A (Fired clay)

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Unidentified polished stone fragments

Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock

Polished black pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite